PHP Cheatsheet with Example and Definition

PHP is a widely used server-side scripting language known for its versatility and integration capabilities. Whether you’re a beginner or an experienced PHP developer, having a comprehensive PHP cheat sheet with examples and definitions can greatly assist you in quickly referencing key concepts. In this article, we provide a detailed PHP cheat sheet that breaks down important PHP functionalities into clear headings, subheadings, and bullet points for ease of understanding and readability.

Basic Syntax and Variables

Definition: PHP is a server-side scripting language that is embedded in HTML for dynamic web page creation.

Examples:

• Hello, World! Program:

<?php
echo "Hello, World!";
?>

• Variable Declaration:

$name = "John Doe";
$age = 25;

Control Structures and Loops

Definition: Control structures and loops allow for conditional execution and repetitive tasks.

Examples:

• If-Else Statement:

if ($age >= 18) {
    echo "You are an adult.";
} else {
    echo "You are a minor.";
}

• For Loop:

for ($i = 1; $i <= 10; $i++) {
    echo $i;
}

Functions and Arrays

Definition: Functions in PHP allow for modular and reusable code, while arrays store multiple values in a single variable.

Examples:

• Function Declaration:

function add($a, $b) {
    return $a + $b;
}

• Array Declaration and Access:

$numbers = array(1, 2, 3, 4, 5);
echo $numbers[0];

File Handling and Database Connectivity

Definition: PHP provides built-in functions for file handling and database connectivity.

Examples:

• Reading from a File:

$content = file_get_contents("myfile.txt");

• Database Connection and Query Execution:

$conn = mysqli_connect("localhost", "username", "password", "database");
$result = mysqli_query($conn, "SELECT * FROM users");

Error Handling and Exception Handling

Definition: Error handling and exception handling allow for graceful handling of errors and exceptions.

Examples:

• Error Handling:

ini_set("display_errors", 1);
error_reporting(E_ALL);

• Exception Handling:

try {
    // Code that might throw an exception
} catch (Exception $e) {
    // Exception handling code
}

Conclusion

This PHP cheat sheet provides examples and definitions for essential PHP concepts, including syntax, variables, control structures, functions, arrays, file handling, database connectivity, error handling, and exception handling. Keep this cheat sheet handy as a quick reference guide to enhance your PHP programming skills.